At least one down payment request is cleared by partial payment

What causes this issue?

You have selected a chain type in which partial invoices are posted as
down payment requests.
A down payment request is considered cleared, even when only partial
payment has been made. This means it is no longer possible to post
another down payment for this down payment request. Therefore the
system creates a residual item for a down payment request for which
only a partial amount has been put down as down payment.
In this down payment chain at least one partial invoice is cleared by a
partial payment, which is posted as a down payment request.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

You can post the outstanding difference as a residual item immediately
or on the next down payment request.
If you require the difference amount immediately, select <ZK>Post
Residual Item</>
The system creates a new down payment request for the residual item.
The system enters the difference amount. The system copies all further
data, such as posting date and cash discount terms from the partially
paid down payment request, for which the residual item was created.
If you require the difference amount on the next down payment request,
do not select the above-mentioned function.
If you post a new down payment request later, although residual items
still exist, the system posts down payment requests to the residual
items available. The down payment request amount entered is the amount
of the residual item. All further data is copied from the partially
paid down payment request, for which the residual item is created.
If you post a final invoice as the next transaction, the system does
not post residual items, although residual items are still available.
The down payment requests and residual items which are still open are
cleared in the final invoice.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.